/*!
 * jQuery UI Dialog @VERSION
 * http://jqueryui.com
 *
 * Copyright 2014 jQuery Foundation and other contributors
 * Released under the MIT license.
 * http://jquery.org/license
 *
 * http://api.jqueryui.com/dialog/
 */
(function( factory ) {
    if ( typeof define === "function" && define.amd ) {

        // AMD. Register as an anonymous module.
        define([
            "jquery",
            "./core",
            "./widget",
            "./button",
            "./draggable",
            "./mouse",
            "./position",
            "./resizable"
        ], factory );
    } else {

        // Browser globals
        factory( jQuery );
    }
}(function( $ ) {

    return $.widget( "ui.dialog", {
        version: "@VERSION",
        options: {
            appendTo: "body",
            autoOpen: true,
            buttons: [],
            closeOnEscape: true,
            closeText: "Close",
            dialogClass: "",
            draggable: true,
            hide: null,
            height: "auto",
            maxHeight: null,
            maxWidth: null,
            minHeight: 150,
            minWidth: 150,
            modal: false,
            position: {
                my: "center",
                at: "center",
                of: window,
                collision: "fit",
                // Ensure the titlebar is always visible
                using: function( pos ) {
                    var topOffset = $( this ).css( pos ).offset().top;
                    if ( topOffset < 0 ) {
                        $( this ).css( "top", pos.top - topOffset );
                    }
                }
            },
            resizable: true,
            show: null,
            title: null,
            width: 300,

            // callbacks
            beforeClose: null,
            close: null,
            drag: null,
            dragStart: null,
            dragStop: null,
            focus: null,
            open: null,
            resize: null,
            resizeStart: null,
            resizeStop: null
        },

        sizeRelatedOptions: {
            buttons: true,
            height: true,
            maxHeight: true,
            maxWidth: true,
            minHeight: true,
            minWidth: true,
            width: true
        },

        resizableRelatedOptions: {
            maxHeight: true,
            maxWidth: true,
            minHeight: true,
            minWidth: true
        },

        _create: function() {
            this.originalCss = {
                display: this.element[ 0 ].style.display,
                width: this.element[ 0 ].style.width,
                minHeight: this.element[ 0 ].style.minHeight,
                maxHeight: this.element[ 0 ].style.maxHeight,
                height: this.element[ 0 ].style.height
            };
            this.originalPosition = {
                parent: this.element.parent(),
                index: this.element.parent().children().index( this.element )
            };
            this.originalTitle = this.element.attr( "title" );
            this.options.title = this.options.title || this.originalTitle;

            this._createWrapper();

            this.element
                .show()
                .removeAttr( "title" )
                .addClass( "ui-dialog-content ui-widget-content" )
                .appendTo( this.uiDialog );

            this._createTitlebar();
            this._createButtonPane();

            if ( this.options.draggable && $.fn.draggable ) {
                this._makeDraggable();
            }
            if ( this.options.resizable && $.fn.resizable ) {
                this._makeResizable();
            }

            this._isOpen = false;

            this._trackFocus();
        },

        _init: function() {
            if ( this.options.autoOpen ) {
                this.open();
            }
        },

        _appendTo: function() {
            var element = this.options.appendTo;
            if ( element && (element.jquery || element.nodeType) ) {
                return $( element );
            }
            return this.document.find( element || "body" ).eq( 0 );
        },

        _destroy: function() {
            var next,
                originalPosition = this.originalPosition;

            this._destroyOverlay();

            this.element
                .removeUniqueId()
                .removeClass( "ui-dialog-content ui-widget-content" )
                .css( this.originalCss )
                // Without detaching first, the following becomes really slow
                .detach();

            this.uiDialog.stop( true, true ).remove();

            if ( this.originalTitle ) {
                this.element.attr( "title", this.originalTitle );
            }

            next = originalPosition.parent.children().eq( originalPosition.index );
            // Don't try to place the dialog next to itself (#8613)
            if ( next.length && next[ 0 ] !== this.element[ 0 ] ) {
                next.before( this.element );
            } else {
                originalPosition.parent.append( this.element );
            }
        },

        widget: function() {
            return this.uiDialog;
        },

        disable: $.noop,
        enable: $.noop,

        close: function( event ) {
            var activeElement,
                that = this;

            if ( !this._isOpen || this._trigger( "beforeClose", event ) === false ) {
                return;
            }

            this._isOpen = false;
            this._focusedElement = null;
            this._destroyOverlay();
            this._untrackInstance();

            if ( !this.opener.filter( ":focusable" ).focus().length ) {

                // support: IE9
                // IE9 throws an "Unspecified error" accessing document.activeElement from an <iframe>
                try {
                    activeElement = this.document[ 0 ].activeElement;

                    // Support: IE9, IE10
                    // If the <body> is blurred, IE will switch windows, see #4520
                    if ( activeElement && activeElement.nodeName.toLowerCase() !== "body" ) {

                        // Hiding a focused element doesn't trigger blur in WebKit
                        // so in case we have nothing to focus on, explicitly blur the active element
                        // https://bugs.webkit.org/show_bug.cgi?id=47182
                        $( activeElement ).blur();
                    }
                } catch ( error ) {}
            }

            this._hide( this.uiDialog, this.options.hide, function() {
                that._trigger( "close", event );
            });
        },

        isOpen: function() {
            return this._isOpen;
        },

        moveToTop: function() {
            this._moveToTop();
        },

        _moveToTop: function( event, silent ) {
            var moved = false,
                zIndicies = this.uiDialog.siblings( ".ui-front:visible" ).map(function() {
                    return +$( this ).css( "z-index" );
                }).get(),
                zIndexMax = Math.max.apply( null, zIndicies );

            if ( zIndexMax >= +this.uiDialog.css( "z-index" ) ) {
                this.uiDialog.css( "z-index", zIndexMax + 1 );
                moved = true;
            }

            if ( moved && !silent ) {
                this._trigger( "focus", event );
            }
            return moved;
        },

        open: function() {
            var that = this;
            if ( this._isOpen ) {
                if ( this._moveToTop() ) {
                    this._focusTabbable();
                }
                return;
            }

            this._isOpen = true;
            this.opener = $( this.document[ 0 ].activeElement );

            this._size();
            this._position();
            this._createOverlay();
            this._moveToTop( null, true );

            // Ensure the overlay is moved to the top with the dialog, but only when
            // opening. The overlay shouldn't move after the dialog is open so that
            // modeless dialogs opened after the modal dialog stack properly.
            if ( this.overlay ) {
                this.overlay.css( "z-index", this.uiDialog.css( "z-index" ) - 1 );
            }

            this._show( this.uiDialog, this.options.show, function() {
                that._focusTabbable();
                that._trigger( "focus" );
            });

            // Track the dialog immediately upon openening in case a focus event
            // somehow occurs outside of the dialog before an element inside the
            // dialog is focused (#10152)
            this._makeFocusTarget();

            this._trigger( "open" );
        },

        _focusTabbable: function() {
            // Set focus to the first match:
            // 1. An element that was focused previously
            // 2. First element inside the dialog matching [autofocus]
            // 3. Tabbable element inside the content element
            // 4. Tabbable element inside the buttonpane
            // 5. The close button
            // 6. The dialog itself
            var hasFocus = this._focusedElement;
            if ( !hasFocus ) {
                hasFocus = this.element.find( "[autofocus]" );
            }
            if ( !hasFocus.length ) {
                hasFocus = this.element.find( ":tabbable" );
            }
            if ( !hasFocus.length ) {
                hasFocus = this.uiDialogButtonPane.find( ":tabbable" );
            }
            if ( !hasFocus.length ) {
                hasFocus = this.uiDialogTitlebarClose.filter( ":tabbable" );
            }
            if ( !hasFocus.length ) {
                hasFocus = this.uiDialog;
            }
            hasFocus.eq( 0 ).focus();
        },

        _keepFocus: function( event ) {
            function checkFocus() {
                var activeElement = this.document[0].activeElement,
                    isActive = this.uiDialog[0] === activeElement ||
                        $.contains( this.uiDialog[0], activeElement );
                if ( !isActive ) {
                    this._focusTabbable();
                }
            }
            event.preventDefault();
            checkFocus.call( this );
            // support: IE
            // IE <= 8 doesn't prevent moving focus even with event.preventDefault()
            // so we check again later
            this._delay( checkFocus );
        },

        _createWrapper: function() {
            this.uiDialog = $("<div>")
                .addClass( "ui-dialog ui-widget ui-widget-content ui-corner-all ui-front " +
                this.options.dialogClass )
                .hide()
                .attr({
                    // Setting tabIndex makes the div focusable
                    tabIndex: -1,
                    role: "dialog"
                })
                .appendTo( this._appendTo() );

            this._on( this.uiDialog, {
                keydown: function( event ) {
                    if ( this.options.closeOnEscape && !event.isDefaultPrevented() && event.keyCode &&
                        event.keyCode === $.ui.keyCode.ESCAPE ) {
                        event.preventDefault();
                        this.close( event );
                        return;
                    }

                    // prevent tabbing out of dialogs
                    if ( event.keyCode !== $.ui.keyCode.TAB || event.isDefaultPrevented() ) {
                        return;
                    }
                    var tabbables = this.uiDialog.find( ":tabbable" ),
                        first = tabbables.filter( ":first" ),
                        last = tabbables.filter( ":last" );

                    if ( ( event.target === last[0] || event.target === this.uiDialog[0] ) && !event.shiftKey ) {
                        this._delay(function() {
                            first.focus();
                        });
                        event.preventDefault();
                    } else if ( ( event.target === first[0] || event.target === this.uiDialog[0] ) && event.shiftKey ) {
                        this._delay(function() {
                            last.focus();
                        });
                        event.preventDefault();
                    }
                },
                mousedown: function( event ) {
                    if ( this._moveToTop( event ) ) {
                        this._focusTabbable();
                    }
                }
            });

            // We assume that any existing aria-describedby attribute means
            // that the dialog content is marked up properly
            // otherwise we brute force the content as the description
            if ( !this.element.find( "[aria-describedby]" ).length ) {
                this.uiDialog.attr({
                    "aria-describedby": this.element.uniqueId().attr( "id" )
                });
            }
        },

        _createTitlebar: function() {
            var uiDialogTitle;

            this.uiDialogTitlebar = $( "<div>" )
                .addClass( "ui-dialog-titlebar ui-widget-header ui-corner-all ui-helper-clearfix" )
                .prependTo( this.uiDialog );
            this._on( this.uiDialogTitlebar, {
                mousedown: function( event ) {
                    // Don't prevent click on close button (#8838)
                    // Focusing a dialog that is partially scrolled out of view
                    // causes the browser to scroll it into view, preventing the click event
                    if ( !$( event.target ).closest( ".ui-dialog-titlebar-close" ) ) {
                        // Dialog isn't getting focus when dragging (#8063)
                        this.uiDialog.focus();
                    }
                }
            });

            // support: IE
            // Use type="button" to prevent enter keypresses in textboxes from closing the
            // dialog in IE (#9312)
            this.uiDialogTitlebarClose = $( "<button type='button'></button>" )
                .button({
                    label: this.options.closeText,
                    icons: {
                        primary: "ui-icon-closethick"
                    },
                    text: false
                })
                .addClass( "ui-dialog-titlebar-close" )
                .appendTo( this.uiDialogTitlebar );
            this._on( this.uiDialogTitlebarClose, {
                click: function( event ) {
                    event.preventDefault();
                    this.close( event );
                }
            });

            uiDialogTitle = $( "<span>" )
                .uniqueId()
                .addClass( "ui-dialog-title" )
                .prependTo( this.uiDialogTitlebar );
            this._title( uiDialogTitle );

            this.uiDialog.attr({
                "aria-labelledby": uiDialogTitle.attr( "id" )
            });
        },

        _title: function( title ) {
            if ( !this.options.title ) {
                title.html( "&#160;" );
            }
            title.text( this.options.title );
        },

        _createButtonPane: function() {
            this.uiDialogButtonPane = $( "<div>" )
                .addClass( "ui-dialog-buttonpane ui-widget-content ui-helper-clearfix" );

            this.uiButtonSet = $( "<div>" )
                .addClass( "ui-dialog-buttonset" )
                .appendTo( this.uiDialogButtonPane );

            this._createButtons();
        },

        _createButtons: function() {
            var that = this,
                buttons = this.options.buttons;

            // if we already have a button pane, remove it
            this.uiDialogButtonPane.remove();
            this.uiButtonSet.empty();

            if ( $.isEmptyObject( buttons ) || ($.isArray( buttons ) && !buttons.length) ) {
                this.uiDialog.removeClass( "ui-dialog-buttons" );
                return;
            }

            $.each( buttons, function( name, props ) {
                var click, buttonOptions;
                props = $.isFunction( props ) ?
                { click: props, text: name } :
                    props;
                // Default to a non-submitting button
                props = $.extend( { type: "button" }, props );
                // Change the context for the click callback to be the main element
                click = props.click;
                props.click = function() {
                    click.apply( that.element[ 0 ], arguments );
                };
                buttonOptions = {
                    icons: props.icons,
                    text: props.showText
                };
                delete props.icons;
                delete props.showText;
                $( "<button></button>", props )
                    .button( buttonOptions )
                    .appendTo( that.uiButtonSet );
            });
            this.uiDialog.addClass( "ui-dialog-buttons" );
            this.uiDialogButtonPane.appendTo( this.uiDialog );
        },

        _makeDraggable: function() {
            var that = this,
                options = this.options;

            function filteredUi( ui ) {
                return {
                    position: ui.position,
                    offset: ui.offset
                };
            }

            this.uiDialog.draggable({
                cancel: ".ui-dialog-content, .ui-dialog-titlebar-close",
                handle: ".ui-dialog-titlebar",
                containment: "document",
                start: function( event, ui ) {
                    $( this ).addClass( "ui-dialog-dragging" );
                    that._blockFrames();
                    that._trigger( "dragStart", event, filteredUi( ui ) );
                },
                drag: function( event, ui ) {
                    that._trigger( "drag", event, filteredUi( ui ) );
                },
                stop: function( event, ui ) {
                    var left = ui.offset.left - that.document.scrollLeft(),
                        top = ui.offset.top - that.document.scrollTop();

                    options.position = {
                        my: "left top",
                        at: "left" + (left >= 0 ? "+" : "") + left + " " +
                        "top" + (top >= 0 ? "+" : "") + top,
                        of: that.window
                    };
                    $( this ).removeClass( "ui-dialog-dragging" );
                    that._unblockFrames();
                    that._trigger( "dragStop", event, filteredUi( ui ) );
                }
            });
        },

        _makeResizable: function() {
            var that = this,
                options = this.options,
                handles = options.resizable,
            // .ui-resizable has position: relative defined in the stylesheet
            // but dialogs have to use absolute or fixed positioning
                position = this.uiDialog.css("position"),
                resizeHandles = typeof handles === "string" ?
                    handles	:
                    "n,e,s,w,se,sw,ne,nw";

            function filteredUi( ui ) {
                return {
                    originalPosition: ui.originalPosition,
                    originalSize: ui.originalSize,
                    position: ui.position,
                    size: ui.size
                };
            }

            this.uiDialog.resizable({
                cancel: ".ui-dialog-content",
                containment: "document",
                alsoResize: this.element,
                maxWidth: options.maxWidth,
                maxHeight: options.maxHeight,
                minWidth: options.minWidth,
                minHeight: this._minHeight(),
                handles: resizeHandles,
                start: function( event, ui ) {
                    $( this ).addClass( "ui-dialog-resizing" );
                    that._blockFrames();
                    that._trigger( "resizeStart", event, filteredUi( ui ) );
                },
                resize: function( event, ui ) {
                    that._trigger( "resize", event, filteredUi( ui ) );
                },
                stop: function( event, ui ) {
                    var offset = that.uiDialog.offset(),
                        left = offset.left - that.document.scrollLeft(),
                        top = offset.top - that.document.scrollTop();

                    options.height = that.uiDialog.height();
                    options.width = that.uiDialog.width();
                    options.position = {
                        my: "left top",
                        at: "left" + (left >= 0 ? "+" : "") + left + " " +
                        "top" + (top >= 0 ? "+" : "") + top,
                        of: that.window
                    };
                    $( this ).removeClass( "ui-dialog-resizing" );
                    that._unblockFrames();
                    that._trigger( "resizeStop", event, filteredUi( ui ) );
                }
            })
                .css( "position", position );
        },

        _trackFocus: function() {
            this._on( this.widget(), {
                focusin: function( event ) {
                    this._makeFocusTarget();
                    this._focusedElement = $( event.target );
                }
            });
        },

        _makeFocusTarget: function() {
            this._untrackInstance();
            this._trackingInstances().unshift( this );
        },

        _untrackInstance: function() {
            var instances = this._trackingInstances(),
                exists = $.inArray( this, instances );
            if ( exists !== -1 ) {
                instances.splice( exists, 1 );
            }
        },

        _trackingInstances: function() {
            var instances = this.document.data( "ui-dialog-instances" );
            if ( !instances ) {
                instances = [];
                this.document.data( "ui-dialog-instances", instances );
            }
            return instances;
        },

        _minHeight: function() {
            var options = this.options;

            return options.height === "auto" ?
                options.minHeight :
                Math.min( options.minHeight, options.height );
        },

        _position: function() {
            // Need to show the dialog to get the actual offset in the position plugin
            var isVisible = this.uiDialog.is( ":visible" );
            if ( !isVisible ) {
                this.uiDialog.show();
            }
            this.uiDialog.position( this.options.position );
            if ( !isVisible ) {
                this.uiDialog.hide();
            }
        },

        _setOptions: function( options ) {
            var that = this,
                resize = false,
                resizableOptions = {};

            $.each( options, function( key, value ) {
                that._setOption( key, value );

                if ( key in that.sizeRelatedOptions ) {
                    resize = true;
                }
                if ( key in that.resizableRelatedOptions ) {
                    resizableOptions[ key ] = value;
                }
            });

            if ( resize ) {
                this._size();
                this._position();
            }
            if ( this.uiDialog.is( ":data(ui-resizable)" ) ) {
                this.uiDialog.resizable( "option", resizableOptions );
            }
        },

        _setOption: function( key, value ) {
            var isDraggable, isResizable,
                uiDialog = this.uiDialog;

            if ( key === "dialogClass" ) {
                uiDialog
                    .removeClass( this.options.dialogClass )
                    .addClass( value );
            }

            if ( key === "disabled" ) {
                return;
            }

            this._super( key, value );

            if ( key === "appendTo" ) {
                this.uiDialog.appendTo( this._appendTo() );
            }

            if ( key === "buttons" ) {
                this._createButtons();
            }

            if ( key === "closeText" ) {
                this.uiDialogTitlebarClose.button({
                    // Ensure that we always pass a string
                    label: "" + value
                });
            }

            if ( key === "draggable" ) {
                isDraggable = uiDialog.is( ":data(ui-draggable)" );
                if ( isDraggable && !value ) {
                    uiDialog.draggable( "destroy" );
                }

                if ( !isDraggable && value ) {
                    this._makeDraggable();
                }
            }

            if ( key === "position" ) {
                this._position();
            }

            if ( key === "resizable" ) {
                // currently resizable, becoming non-resizable
                isResizable = uiDialog.is( ":data(ui-resizable)" );
                if ( isResizable && !value ) {
                    uiDialog.resizable( "destroy" );
                }

                // currently resizable, changing handles
                if ( isResizable && typeof value === "string" ) {
                    uiDialog.resizable( "option", "handles", value );
                }

                // currently non-resizable, becoming resizable
                if ( !isResizable && value !== false ) {
                    this._makeResizable();
                }
            }

            if ( key === "title" ) {
                this._title( this.uiDialogTitlebar.find( ".ui-dialog-title" ) );
            }
        },

        _size: function() {
            // If the user has resized the dialog, the .ui-dialog and .ui-dialog-content
            // divs will both have width and height set, so we need to reset them
            var nonContentHeight, minContentHeight, maxContentHeight,
                options = this.options;

            // Reset content sizing
            this.element.show().css({
                width: "auto",
                minHeight: 0,
                maxHeight: "none",
                height: 0
            });

            if ( options.minWidth > options.width ) {
                options.width = options.minWidth;
            }

            // reset wrapper sizing
            // determine the height of all the non-content elements
            nonContentHeight = this.uiDialog.css({
                height: "auto",
                width: options.width
            })
                .outerHeight();
            minContentHeight = Math.max( 0, options.minHeight - nonContentHeight );
            maxContentHeight = typeof options.maxHeight === "number" ?
                Math.max( 0, options.maxHeight - nonContentHeight ) :
                "none";

            if ( options.height === "auto" ) {
                this.element.css({
                    minHeight: minContentHeight,
                    maxHeight: maxContentHeight,
                    height: "auto"
                });
            } else {
                this.element.height( Math.max( 0, options.height - nonContentHeight ) );
            }

            if ( this.uiDialog.is( ":data(ui-resizable)" ) ) {
                this.uiDialog.resizable( "option", "minHeight", this._minHeight() );
            }
        },

        _blockFrames: function() {
            this.iframeBlocks = this.document.find( "iframe" ).map(function() {
                var iframe = $( this );

                return $( "<div>" )
                    .css({
                        position: "absolute",
                        width: iframe.outerWidth(),
                        height: iframe.outerHeight()
                    })
                    .appendTo( iframe.parent() )
                    .offset( iframe.offset() )[0];
            });
        },

        _unblockFrames: function() {
            if ( this.iframeBlocks ) {
                this.iframeBlocks.remove();
                delete this.iframeBlocks;
            }
        },

        _allowInteraction: function( event ) {
            if ( $( event.target ).closest( ".ui-dialog" ).length ) {
                return true;
            }

            // TODO: Remove hack when datepicker implements
            // the .ui-front logic (#8989)
            return !!$( event.target ).closest( ".ui-datepicker" ).length;
        },

        _createOverlay: function() {
            if ( !this.options.modal ) {
                return;
            }

            // We use a delay in case the overlay is created from an
            // event that we're going to be cancelling (#2804)
            var isOpening = true;
            this._delay(function() {
                isOpening = false;
            });

            if ( !this.document.data( "ui-dialog-overlays" ) ) {

                // Prevent use of anchors and inputs
                // Using _on() for an event handler shared across many instances is
                // safe because the dialogs stack and must be closed in reverse order
                this._on( this.document, {
                    focusin: function( event ) {
                        if ( isOpening ) {
                            return;
                        }

                        if ( !this._allowInteraction( event ) ) {
                            event.preventDefault();
                            this._trackingInstances()[ 0 ]._focusTabbable();
                        }
                    }
                });
            }

            this.overlay = $( "<div>" )
                .addClass( "ui-widget-overlay ui-front" )
                .appendTo( this._appendTo() );
            this._on( this.overlay, {
                mousedown: "_keepFocus"
            });
            this.document.data( "ui-dialog-overlays",
                (this.document.data( "ui-dialog-overlays" ) || 0) + 1 );
        },

        _destroyOverlay: function() {
            if ( !this.options.modal ) {
                return;
            }

            if ( this.overlay ) {
                var overlays = this.document.data( "ui-dialog-overlays" ) - 1;

                if ( !overlays ) {
                    this.document
                        .unbind( "focusin" )
                        .removeData( "ui-dialog-overlays" );
                } else {
                    this.document.data( "ui-dialog-overlays", overlays );
                }

                this.overlay.remove();
                this.overlay = null;
            }
        }
    });

}));
